[fix] add test showing .append() breaks help

refs #120

tests/test_initial_parsing.py

@@ -99,11 +99,49 @@ def test_get_helpers():
     assert red[0]._get_helpers() == ['modules', 'names']
-def test_help_is_not_crashing():
+def test_help_is_not_crashing1():
     some_code = "ax + (z * 4)"
     red = RedBaron(some_code)
     red.help()
     red[0].help()
+    red.help(5)
+    red[0].help(5)
+    red.help(True)
+    red[0].help(True)
+
+
+def test_help_is_not_crashing2():
+    some_code = "a(b)"
+    red = RedBaron(some_code)
+    red.help()
+    red[0].help()
+    red.help(5)
+    red[0].help(5)
+    red.help(True)
+    red[0].help(True)
+
+
+def test_help_is_not_crashing3():
+    some_code = "a(b, c)"
+    red = RedBaron(some_code)
+    red.help()
+    red[0].help()
+    red.help(5)
+    red[0].help(5)
+    red.help(True)
+    red[0].help(True)
+
+
+def test_help_is_not_crashing4():
+    some_code = "a(b)"
+    red = RedBaron(some_code)
+    red[0].call.append("c")
+    red.help()
+    red[0].help()
+    red.help(5)
+    red[0].help(5)
+    red.help(True)
+    red[0].help(True)
 def test_assign_on_string_value():